Excel error -2146777998

Hi LabView community,
I wonder is someone has encountered this problem before me. I am maintaining an application which generates 2 excel reports which are similar. The app generates them in a case structure wired to the loop value (i) of a for loop. (1st report in case 0, 2nd report in case 1)
All is good and works well on a development system, and 2 other PCs but on one particular customer PC, the above excel error occurs sometime between finishing the 1st report and starting the 2nd.
Meagre Google links point to problems not closing Excel after the 1st report - which is fine, but in my code there is only 1 reference to the report which is passed through each invoke node until there's a "Dispose Report.vi" at the end.
I also dont understand why, if excel being open causes this error, the error doesnt occur on the other 2 test PCs (all PCs are Windows 7-64/ Office 2010).
If Excel is opened again in parallel thanks to the marvels of auto parallism, this also confuses me because at the end of the 1st report there is a small delay inside a flat sequence so this would seem to restrict auto parallelism by using rules of dataflow , as well as the for loop generating the report mentioned earlier.
If I swap around the order of report generation, the failure still occurs between report 1 & 2.
Any ideas , world?
System is LabView 2011
Thanks,
Chris
Attachments:
Dispose Report.png ‏12 KB

Hi El_Penguino,
The Dispose Report does close the reference to the report, however in my research it seems that Excel occasionally stays open behind the scenes, which may be what's causing the error. After you receive the error, open up Task Manager and see if there's an Excel process still running when Excel is not open. If so, stop the process, and attempt running your program again.
Here's the discussion I found that mentions the background Excel process messing with the Report Generation Toolkit:
Error -2146777998 Unkown System
http://forums.ni.com/t5/LabVIEW/Error-2146777998-Unkown-System/m-p/720393/highlight/true#M329651
I hope this helps!
David S.

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Hi El_Penguino,
The Dispose Report does close the reference to the report, however in my research it seems that Excel occasionally stays open behind the scenes, which may be what's causing the error. After you receive the error, open up Task Manager and see if there's an Excel process still running when Excel is not open. If so, stop the process, and attempt running your program again.
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Excel error -2146777998

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